This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 17 |
| 4 | 193 |
| 5 | 4385 |
| 6 | 199233 |
| 7 | 18104449 |
| 8 | 3290333441 |
| 9 | 1195981275649 |
| 10 | 869438472061953 |
| 11 | 1264105507046557697 |
| 12 | 3675850064599476867073 |
| 13 | 21377762572680129683660801 |
| 14 | 248654719090254548473238011905 |
| 15 | 5784437834927690918603693712506881 |